/*
 *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MODULES_AUDIO_PROCESSING_NS_SIGNAL_MODEL_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_NS_SIGNAL_MODEL_ESTIMATOR_H_

#include <array>

#include "array_view.h"
#include "histograms.h"
#include "ns_common.h"
#include "prior_signal_model.h"
#include "prior_signal_model_estimator.h"
#include "signal_model.h"

namespace webrtc {

    class SignalModelEstimator {
    public:
        SignalModelEstimator();

        SignalModelEstimator(const SignalModelEstimator &) = delete;

        SignalModelEstimator &operator=(const SignalModelEstimator &) = delete;

        // Compute signal normalization during the initial startup phase.
        void AdjustNormalization(int32_t num_analyzed_frames, float signal_energy);

        void Update(
                rtc::ArrayView<const float, kFftSizeBy2Plus1> prior_snr,
                rtc::ArrayView<const float, kFftSizeBy2Plus1> post_snr,
                rtc::ArrayView<const float, kFftSizeBy2Plus1> conservative_noise_spectrum,
                rtc::ArrayView<const float, kFftSizeBy2Plus1> signal_spectrum,
                float signal_spectral_sum,
                float signal_energy);

        const PriorSignalModel &get_prior_model() const {
            return prior_model_estimator_.get_prior_model();
        }

        const SignalModel &get_model() { return features_; }

    private:
        float diff_normalization_ = 0.f;
        float signal_energy_sum_ = 0.f;
        Histograms histograms_;
        int histogram_analysis_counter_ = 500;
        PriorSignalModelEstimator prior_model_estimator_;
        SignalModel features_;
    };

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_NS_SIGNAL_MODEL_ESTIMATOR_H_
